Update versions for test dependencies

pom.xml

@@ -10,7 +10,7 @@
 
     <artifactId>jfreechart</artifactId>
     <groupId>org.jfree</groupId>
-    <version>1.5.4</version>
+    <version>1.5.5-snapshot</version>
     <packaging>jar</packaging>
 
     <organization>
@@ -61,19 +61,19 @@
         <dependency>
             <groupId>org.junit.jupiter</groupId>
             <artifactId>junit-jupiter-api</artifactId>
-            <version>5.9.1</version>
+            <version>5.10.2</version>
             <scope>test</scope>
         </dependency>
         <dependency>
             <groupId>org.junit.jupiter</groupId>
             <artifactId>junit-jupiter-engine</artifactId>
-            <version>5.9.1</version>
+            <version>5.10.2</version>
             <scope>test</scope>
         </dependency>
 		<dependency>
 		    <groupId>nl.jqno.equalsverifier</groupId>
 		    <artifactId>equalsverifier</artifactId>
-		    <version>3.12.3</version>
+		    <version>3.16.1</version>
 		    <scope>test</scope>
 		</dependency>
     </dependencies>